Financial Instruments and Risk Management (Tables)

9 Months Ended

Sep. 30, 2014

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Components of aircraft fuel expense

The following table summarizes the components of aircraft fuel expense for the three and nine months ended September 30, 2014 and 2013:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2014		2013			2014		2013
	(in thousands)
Into-plane fuel cost	$	171,138	$	143,978		$	473,994	$	402,066
Settlement losses (gains)	—		6,663			—		6,348
Unrealized mark-to-market losses (gains)	—		(5,655		)	—		3,489
Premium expense recognized related to fuel option contracts	446		—			913		—
Aircraft fuel	$	171,584	$	144,986		$	474,907	$	411,903